Dictating and reproducing apparatus



Oct. 30, 1934- N, EL PONTE 1,978,525

DICTATING AND REPRODUCING APPARATUS Filed April 1, 1931 INVENTOR. FEDERICO N051. Pa/vTE M ambz vla ATTORNEY.

Patented Oct. 30, 1934 DICTATING AND REPRODUCING APPARATUS Federico Nicolas Del Ponte, Buenos Aires,

Argentina Application April 1, 1931, Serial No. 526,948

1 Claim. (Cl. 181-21) The present invention relates to microphones, material, the sound effects will be greatly imand more particularly has reference to microproved.

phones provided with a sound-collecting cham- In accordance with the present invention, it ber, the interior of which is lined with soundis essential that the membrane 3, which is of 5 absorbin material, a shape corresponding to that of the collector 0 The major object of the present invention is 1, be maintained under tension. For this purto provide a microphone consisting of a trunpose, the membrane is secured to the base of the cated pyramidal sound-collecting device propyramidal collector 1 and is further secured at vided with a microphone capsule at the apex e ap th eo o a tensioning member 4 l0 portion thereof and having the interior of the W ch, in t n, is Con ected o e p p sound-collecting device lined with sound-absorbion of h coll c or 1. h ten o ns member ing material, 4 may be formed of india rubber or other suit- Another object of this invention is to proable material which will serve the purpose of vide a. microphone comprising a, truncated maintaining the membrane 3 under tension.

15 pyramidal sound-collecting device, the interior A microphone Constructed in accordance with of which is lined with sound-absorbing material he pr n inv i p v h mpi ment int i d under t i of undesirable sounds upon the microphone cap- With th nd th important; object i sule 2, these undesirable sounds being deadened iew, which may be incident to my improveby the elastic ellect 0f the membrane 3.

20 merits, the invention resides in the parts and While I have shown and described the we combinations to be hereinafter set forth and ferred embodiment of my v I W sh it claimed, with the understanding that the sevto be understood that I do not fi e yself eral necessary elements comprising my invention to t e Precise details herein Set orth by way may be varied in construction, proportions and of illustration as it is apparent t a y 25 arrangement, without departing from the spirit changes and va a s ay be made therein and scope of the appended claim, by those skilled in the art, without departing In order to make my invention more clearly from the spirit Of the invention or exceeding the understood, I have shown in the accompanying Scope f e pp ded a mdrawing means for carrying the same into prac- In a Sound recording System, a m c ophone 30 tical efiect without limiting the improvements having e Shape f a truncated pyramid, the

in their useful applications to the particular microphone Comprising a ca p constructions which, for the purposes of e ramidal flexible sound-absorbing membrane planation, have been made the subject of W in t b means a a n the ap x f th illustration. box for tensioning the flexible membrane to the 35 In the drawing: box, and a microphonic capsule at the truncated Figure 1 is a vertical sectional view of a apex of the box. microphone constructed in accordance with the FEDERICO NICOLAS DEL PONTE. presentinvention; and

, Figure 2 is another sectional view taken on line 2-2 of Fig. 1.

Referring to the drawing, in which similar reference characters are used to designate corresponding parts, I have shown a microphone 45 consisting of a truncated pyramidal soundcollecting device 1 which may be formed of wood I or other suitable material. At the apex portion of the truncated pyramid, I have provided a microphone capsule 2 which may be of any of 50 the well-known types now in use. In order to t avoid undesirable effects in the sound transmitted to the microphone capsule 2, the interior of the truncated pyramidal collector 1 is provided with a membrane 3 of india rubber or 55 felt. By making the membrane 3 of suitable 

